Miter-cutting machine.



EA'TENTED JULY 2 8. Hum MITER CUTTING APPLIOATION FILED DB Q\ 16,- 1

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INVENTOR B I v MA /202 I TTORNEY No. 734,185. PATENTED JULY 21,1903. S. LEVAN. MITER CUTTING MACHINE.

APPLICATION FILED DEO.16, 1902.

N0 MODEL.

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WITNESSES: I MINVENTOR' I BY I ATTORNEY THE mums vnzns cb, wormumu, WASHXNGYQN, u. c,

Tatented July 21, 1903.

PATENT OFFIQE.

SAMUEL LEVAN, OF SAGINAW, MICHIGAN.

MlTER-CUTTING MACHINE.

SPECIFICCATION forming 'part of Letters Patent No. 734,185, dated July 21, 1903-.

Application filed December 16, 1902a Serial No. 135,421. (No model.)

chines, and more particularly to improvements in miter-cutting machines of the class described in Patent No. 646,228, issued to me March 27, 1900.

The improvements consist in means for cutting tenons on the ends of timbers, means for regulating the depth to which the tenons shall be cut, means for cutting skew or double miters, and for adapting a miter-cutting machine having a relatively small arc to cut wide angle-bevels, a simple device for locking the guides in position to cut any bevel, and a pivot arrangement whereby the saw may be swung through the full arc with a minimumopening in the back of the miterbox.

My invention is illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of a miterbox having my improvements. Fig. 2 is a top plan view of the pivoted frame in which the saw-guides are secured with the latch in place. Fig. 3 is a reverse View of the same. Fig. 4 isa crosssection on the line was of Fig. 3. -Fig. 5 is an elevation, partly in section, of the device for regulating the depth of the out. Fig. 6 is a detailpertaining to the same. Fig. 7 is a bottom view of the locking device. Fig. 8 is an elevation of-the same, partly in section. Fig. 9 is a detail of the lever for operating the latch. Fig. 10 is a plan view of the back pair of legs with a portion of the pivoted frame dotted in position. Fig. 11 is an end View of the back pair of legs. Fig. 12 is a detail of a sliding block.

My invention has a work-table 1 and a hack 2, secured to a light framework 3, supported by pairs of feet 4 and 5 at each end and pairs of feet 6 and 7 midway the front and back. The framework may be of metal and the feet formed integral with it; but in practice I prefer to make it of wood and secure the feet to it by screws or otherwise.

The saw 8 is guided in a pair of blocks 9*, vertically slidable in tubular slotted standards 9 These standards are fixed at their lower ends in a metal frame 10. Passing through abridge 10 in front of the rear standard is a pivot 7", carried byallug 7 midway between the back pair of feet 7. The center of the pivot 7 lies in the plane of theback 2. The saw works in a narrow slit\2f*, and when it is swung through an arc to makea bevel cut its pivoted center lies always in the plane of the back. There is therefore no lateral movement of that part of the saw that passes through the slit 2*, and the slit may therefore be very narrow. This feature of my invention permits of cutting very accurately small pieces that could not be held'in place if the slit 2? were wide.

The framelO consists of two parallel bars 10, substantially Z-shaped in section, oonnected at the ends where the standards are secured and also by a rib 10, near the position of the locking device. An opening 11 is left between the side bars, through which a timber maybe passed up from below for mortising its ends or cutting tenons thereon.

This opening is closed by a wooden block 12 when not in use.

To quickly adjust the device for limiting thedepth of out, Iprovide within the standard 9 a vertical rod 13, having its lower end 13 bent horizontally to form a stop for the guide-block 9*, as is shown in Fig. 5. A cup 14, with a mouth14 and a flanged bottom 14", is securedto the top of the standard. It has holes 14 through its top and bottom to guide the rod 13. A stiff metal strip 15, having a hole 15 through which the rod passes, projects through a slot 14 in the cup opposite its mouth. The rod is free in the strip only when perpendicular to it.

A helical spring 16 on the rod between the top of the cup and the strip causes the strip normally to bind on the rod. 'By pressing down the outer end of the strip 15 it is brought perpendicular to the rod 13, which may be lowered easily. When the strip is released, the rod cannot be lowered, although it can be raised. I

I prefer'to make the device for holding the rod as shown and described; but it is apparcut that a guide for the rod and a clampingstrip held normally at an angle to bind on the rod are the essential features.

To permit the cutting of skew bevels or double miters, I provide a pair of bars 17, of which one is shown in Fig. 1. One end of the bar is secured by a thumb-screw 18 to a block 18, slidable on the side bar 10 of the frame 10. These blocks have longitudinal grooves 18", adapted to engage the top flanges of the side bars, which have downward flanges 10 on their outer edges. The inner ends 17 of the bars reach to the blade of the saw. These bars may be set to support the work at any angle with the back 2 for cutting thembeveling in two directions when the saw is swung to any angle of its arc. The bar 17 may also be clamped at any angle with the saw and used as an auxiliary back for cutting an angle greater or less than that permitted by the swing of the frame 10.

The angles to be out are measured on a quadrant 19, graduated to degrees each way from the center, fixed to the framework 3 beneath-the pivoted frame 10. The quadrant has a deep slit 19 on its inner side at each degree-point, into which fits a knife-blade 20 on the latch 20, carried by the pivoted frame 10.

The latch 20 consists in aplate 20 having adepressedlongitudinalrecess 20andadownward tlange 20 at the rear end. It is slidably held between the lower flanges 10" of the side bars of the frame by inward flanges 21 on depending lugs 2l,integral with the side bars 10. The latch is secured to the frame by a pin 22, passing through slotted holes 20 and fixed in the lugs 21 at its ends. A compressible coiled spring 23 for operating the latch is held in the recess between its front end and the pin 22. A forwardly-extending guiding-flange 20 projects under the quadrant.

To operate the latch, I provide a double bell-crank lever 24. (Shown in Fig. 9.) It is supported byits trunnions24in slots 2l in the rearends of the lugs 21. hen the latch is forward, the ends 24" of the lever are parallel to the side bars 10*, as in Fig. 7. By pulling down either end the loop 24 of the bellcrank lever is broughtto bear on the flange 20 forcing the latch backward against the spring 23, as shown in Fig. 8. The latch will stay in this position till the lever is turned up again.

By the means above described I have provided a miter-cutting machine in which may be cut all the ordinary forms of bevels and which, in addition, will cut tenons on the ends of timbers, double or lap miters, and also angles not ordinarily permitted by the swing of the miter-saw. I have provided simple and easily-operated devices for regulating the depth of cut and for securely locking the saw to cut at any angle with the back. I have, moreover, reduced to a minimum the opening in the back for the passage of the saw, thereby adapting the machine for use in cutting very small pieces, that could not be held in place if the opening were large.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A miter-cutting machine comprising in combination a supporting-framework; a worktable; a back at right angles to the table; a metal frame formed with a vertical opening adapted to receive the ends of timbers for tenoning, said frame being movable about a pivot in the plane of the back; a removable wooden block adapted to fill the opening in the frame; a block slidable lengthwise on the side of the frame; a bar pivoted to said slidable block; a graduated quadrant under the frame, said quadrant having an interior radial slit at each graduation; a spring-actuated latch slidable lengthwise said frame, said latch having a projecting blade adapted to fit the slits in the quadrant and hold the frame stationary; said latch being normally held by its spring to engage the quadrant; means for sliding the latch against the action of the spring and for automatically holding it out of engagement with the quadrant; a

vertical tubular standard fixed in each end of the frame; a saw-guiding block slidable vertically within each standard; a vertical rod within and extending above each standard, said rod having its lower end turned horizontally under theguiding-block; aguide for the rod at the top of the standard; a metal strip formed with a hole through which the rod passes freely only when perpendicular to the strip, said strip being movable about a fulcrum in proximity to said guide; and a spring to hold the strip normally oblique t0 the rod.

2. In combination with a miter-cutting machine of the class described a frame carrying verticalstandardshavingslidingguide-blocks therein, said frame being pivoted at a point between said standards to turn about an axis in the plane of the back of the miter-cutting machine.

3. In combination with a miter-cutting machine of the class described having a frame carrying vertical standards with sliding guide-blocks therein; a vertical opening in the frame adapted to receive the ends of timbers for tenoning; and a removable wooden block adapted to till said opening.

4. In combination with a miter-cutting machine of the class described having a swinging frame carrying vertical standards for guiding the saw; a block slidable lengthwise on the side of the frame; a screw for fixing the block on the frame; and a bar pivotally secured to the block.

In testimony whereof I afiix my signature in presence of two witnesses.

SAMUEL IJEVAN.

Witnesses:

P. M. HOLDSWORTH, JAMES C. HANSON. 

